Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1fb7b0bf555365…

MALICIOUS

PDF

72.5 KB Created: 2021-09-30 13:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12f9c0cc4e0438828ac06a701051c0e7 SHA-1: ffa207f343a480b2d77c116ea33a1b24f9cb2157 SHA-256: ce1fb7b0bf55536550c44e52534232494e384f2f9c3dc207f00b14f922c1af1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ezmoving.com/file/pixivibofowofi.pdf In PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/56781920461.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/fokerukemojipibut.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/masitulogusabexizatatu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/57614453431.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/87089314260.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/karoxebajagasaf.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/23961032353.pdfIn PDF document text
    • http://519pf.com/userfiles/files/tevewo.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/71206521954.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421c1636cc9---nadoxeviruremur.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/kanokowexu.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/51968060020.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/lenovakapa.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/44107881287.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95729b48---tojanadovuzi.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/mimojevoresak.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/leberozanej.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/8896034787.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/bevofasope.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/31362849165.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/zegumepatatafivigizobos.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/11340331102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stressed+out+roblox+idPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 18640 bytes
SHA-256: ed0deaa90331e6a4d1913f53fccb04b88e66b7022698cbdf0cfd0651725825fd
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 10392 bytes
SHA-256: d9166952cedce2afc48188996e58a9a4659c4e9bcdbd5475e9eb26f3b0c1b01a
font_02_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1